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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28624cbc467fcdb33383d2bfb3273a07a42cbbbfd95ccda449326f981786675' 
  AND token = 'GHT2Rcdgo3xNLOLxmYxnvZtK7r/4P77QwHGnuv1o+H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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