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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdacaf3525e36aab53a11204295d4d0a71a303e159ea19007885f46ff8b644d' 
  AND token = 'j9JjH99PH4LQlRvcwm2q2jaIpcxpitRxyy3uWHE34lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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