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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f8b0c020e2521952ab7e6e4ae13fba4abb3a7de0dde672660faab23fb5d6527' 
  AND token = 'LJVmbnOK7QLXFMhrLYQ//6eAhL3rAy55Mepo3hnoLZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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