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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096b5476c8a675aad34c6554680b67e941be44cc5b09420c06953570155d1847' 
  AND token = '/Kh4IdtUpLxMP+8dNPuw4ER40YGKpM8nf+aGWebfqGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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