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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509f4e4d4f9e3f0c07454c65d7ea86d48167fe28bd4732dacd938c9fb9681c35' 
  AND token = 'vU5gdNZaq0Zl/SArk2WK1MIOlqVL07FuuM0S0I01tq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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