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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32d12cc88ace73d027c230fa56525c153759ab0c539fd70b1aac48f2b7cc5b2' 
  AND token = 'yOpFj0ED7Fm6bsKd7FljgK3YZqWso2YAW+g71jDb5f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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