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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5ed77377cfb13c7b2edeaa437025b2c69675e21fb89d77268b6e118222d82b' 
  AND token = '3d6ePEqIzZq0Rv1abt5ta70J3VObeTO+pR3rp4czoQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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