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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f61ec568e7a7b6b86ace04bcb05651b2b4499a73f12e25180d36ad78b43b154' 
  AND token = '1YgiDgwiKnng1ExEE2G1k4VUNsQVEuh8V20C9i1IGmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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