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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92170baee1dccdab1ef25ee0a91ea13829d89371ef19bdd3cfcddec1ea7f3af8' 
  AND token = '+4SMYOILl+iyKMRQOBaYTQ8MFpwEls/wi2EI/K2URME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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