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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703debb3cbb730e4bad1f180824a3ea967dc27748d3488045090da7670f519f9' 
  AND token = '+16XlpW1ZAST4n783MZHDPV5jqM6+JmlR2XceKosaBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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