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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa195e9832fa645660f734a04963ca87481bf0a7f062ded2c1c97f88b0977d4' 
  AND token = 'ErFltng+tAKJHlXJk9yDD92cq+3Vp7FwuJCK8vLnSi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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