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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86125d9cd8bf4ec9008e69dbafbc8b30245e8a6aae411dcc55dae9f4c5c9c3e' 
  AND token = '/HvDSQ//xDHnTiQUE+0qQkvtl+MkNQWZLnevolFI/Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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