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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5785cdb7458f437db03130d9659dbf1c175449f2d3d9aa019cc7fd5925abd4' 
  AND token = 'MlEakoKIiPczyJ9OiOj4RnyZkxJ/xSZcRYG6rbai/ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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