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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2431b9afda03dd8c2e116e72e6965d82db31710d8360134a192922b0c23304ac' 
  AND token = 'tn9N6smK7JX920blypWcnMSayP38lnTVh2HwvoIfUVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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