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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bca724f61c4f831966a877f25babf04d8f2c474261b7676dc9f8b0904802831' 
  AND token = 'eD1folGNI32xYV1nK5EyIs46WeNM+7lGo82RVxWu6TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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