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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0607f1f324e7c66e41e99fcb9d04dac342437d94cd23c8c474f450ec07caba6a' 
  AND token = 'Mv4Y3sfSf7dK/5aqGxD/No5Cbcl1M8qXsxiXfcg9+jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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