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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ea1ee99e492892961bc437c73f3142d06b19c85e432541b5b27b3cd6cc9b67f' 
  AND token = '0c4YAXmtY5xpAZMS0noNukJDgmSu5A3O4whe0vOP2zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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