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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e95780fd7b58f12477dcffa11fb2a85dcc01e9b540802ef7f9e8b1c84c5965' 
  AND token = '1It5+poEKI44W9vLBApNtfbwI09oIm3VYP6RdmbYGPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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