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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ddf2571c2a7be5af889bdd2317d59def299e05f130b3d7cfa77c744f66f985d' 
  AND token = 'bigGppyXUfbA+JyfHlDXLM2nq5BFfBE9budk9xdECCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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