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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c659eb865f54669fc82e7b47fee17942f5ffd0fe15c59fe097ac3505557bfa3' 
  AND token = 'ix02ilL07xXdM5XpVnPP5wi6ffb3aHw2XCUo3FG9ltA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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