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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f01fa7aea50157550334b19d4dd3fd4b9f08add1166fab289d55e2a2ad8591d' 
  AND token = '8oJEFXR12Qj6EXHIOCpNDgZHy5rvrvW7p/lVz2Ttu9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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