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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c4d5714904c4d68c7c89a642526d20010bf61a41bfdbae115d830eb890eb2c' 
  AND token = '7IQYnPWhCPfJEH4klEfMuLhH2mnn2PXYhgw8bydywQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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