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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bd271721a06c83c893fe1b85eca49f33ac83d2f53e638db3c69eb249cac9fa' 
  AND token = 'odn7BmVRbGu3aPXkqZWzauWetHch7OtG/h4v75GDxD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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