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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfbfad63c38e3a0f4539e16899012710fda9f6451f89c18100de0aebf938b3db' 
  AND token = 'Kbr3SNXBYf9Grepo0/oWaTiwKx/yxBqbLYs6ri8IBsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}