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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c687667319ae37cb87324af82ccc17a0ab2001cd320fd92949061ea0bb8f65a' 
  AND token = 'O2X03V31wlkoe4OxMm+IJkH151xWplJ1SypiS9u6kY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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