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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423cae4146fbdbd51130614166af2f2a5e8f1d9a04b44d264f021e971e3f321e' 
  AND token = 'HIVCznK8mxHzv6R5qmuLth+DdcKbllnztH9l0N8NqE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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