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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4291f73d7039d97b3d7c2dd58ca1ed602b9f8112b120cea78e8099f55994db' 
  AND token = 'OIScvAY7l457pIMeJwvTVgdYoD1kGh6p4D+FKXFaiTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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