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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276bb5eee20fa11db90d1b49e689f582d22249bc03e576cd3181b9ac6b98d2dc' 
  AND token = 'yYZn+GtkaJnu2eZhsOc85QfRaj25VVdWHkorCAjMpHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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