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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0bea79b29d4948e8a333b7950f9f5ee60a04ba16c9832c5e2ac4d5612ff357' 
  AND token = 'b6uui2LXp3R4UutKRpATnEey8b6s75MNqD1Z3E6uCbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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