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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9a14f824757d3daf2e551a9a57d401b9e5eeb15653005beb515877a6d9a6cf' 
  AND token = 'x/nUXiYhq9rRIZE/kayS0777SeDScfR03+gGpusXNMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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