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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa30a385144225eb46a7eb4904655a3d6fef2285619b6630ecad4e0140bd7562' 
  AND token = 'S3h4zLGlQotwJUKXwME4v1ul7vLt3TCZjPKNud7Ojz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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