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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31d0e748c24aab35de0a28b5fe3edba55616fee98f92f1bf155ad1714f0bac5' 
  AND token = 'X9+boK/rauBRqnbnYWiMDe80AouHrH0wmXPi+H25RLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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