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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc2865859ecd6fb9f27315f93e2f726f669a49e32928cc6bcfe6eebaffc1fa5' 
  AND token = 'iXtrfPl7P846rC/9rHe2/4v8yJG47qc+304aOQWVaJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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