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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45bf7da876e6b8ef1ea6449aa3516c599f8472644d8b85ed85f6fa95b15f6ae9' 
  AND token = 'Y2HtD3ZXu/wHT7lkARj6SrrbL/EjW4Kl/+QRZADr854=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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