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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc08756dd8d4e6cd5848be154b18cffb1d8f7e4d39311cd8b72cbd7467cbd96' 
  AND token = 'N/35PDToZdCiqvbAdFH8UBpKiuRwCDXSZe5drGiFUio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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