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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bbc192c78abdb08d353a9b34b5ab5859a54d3f9993947edcf57190afc78e33' 
  AND token = 'UmzrnqhekPI/xQ8HR+sTJQITpJE5YRPT/8Cazzxxbbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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