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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13451a3f2772e2a3e48eab5526b6b28ee0728bee693fec052719414a6ddc3dc' 
  AND token = 'NXCKHywUA6mHynzI5p0FMwk+cXS3RVxrEHBiqIATNgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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