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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b74c7ac88f4007760c4ae5ebfb0f7e91ffbc29208cdf61387d74db0a3032a16' 
  AND token = 'K3yerKG5eT7pY9C/Ok/bm7p4IR7xx0D+5sGiSWdezJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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