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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee94ad571c8bc12a0faaca9de50dd23376dd0661417b43168592c44c79bd0e1' 
  AND token = 'mDEAQteBw4XN7Qdm1a1B4p9r+MjB/IgFrG18z4z+EKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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