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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c192a7531fb8dd4de03043a23fe0aa3975f5e719a0ba25260c0f1dc9583eceb2' 
  AND token = 'fFeJar6Ydsj/1uFv5ybCi+tchnHlDg3jTVR+mESB7lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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