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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '561af44d411a51dce7e0f8feaf45816ed6f13525a3afe20b1f863cfa68228a5f' 
  AND token = 'fyr36jtMUB8REqxbe2gYL/8mO5HxK0f1lSdW+ywUuKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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