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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ddd54291dc22078f1194a73ced8cece6d256593863f0849735ec96cc08e612' 
  AND token = 'D+LEXw3E9R7t59SePPq9egYaRBeXXJcqtxHI85z93BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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