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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c23cc4a9a565b71787b26048c8b7aa0642a18c68bfbea0a299814b9eb8da4d' 
  AND token = 'zk3pyQ54O9YBl0wSmQ+T6L+hENiHxeWuk2FmkEA7684=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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