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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872ffc81fb7a3007b293a4ecd62964d0e61c8a3fd91d9baae32078fc5717e329' 
  AND token = 'JhcRFC0mKTDNcL99dSKTA3TfTRD4uc8rj1He/qRx1M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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