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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4acf7a1f33118bcba088b2fa58c2e9b508ef26b1b2b7a3cec54a2a84fa92c0' 
  AND token = 'g1CWoBYsQOm9XudAQvCLL9PTfLWFr5Ozkia+fm1DH64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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