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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15bda7c5b996319fdc51d012d44a98fc2ac6e6f7ad3cbb663cc61eef9d899503' 
  AND token = 'A/6tL+8OWigafrKWrj/YEEeFQyTBuojVety2246h608=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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