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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd97b0f7f8e85a01e7f5c67bf65623a3519d23dc9172b33ca0bd92ffbe75d10' 
  AND token = 'Lbma3M7Dz3Pn38mM5zSITZj4QQelqZe3lQhTvmsIeTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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