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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0adeeb295ceb33ce254a8cd84da43f8f6790a0039c2e8bab9376fcc83aa33be' 
  AND token = 'OKXkQCblp0rZ6Bi/YX0PB7TFYTekoSXPkvz8Ds4WNiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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