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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96374ff78429ae757e91384c788a63f3959322b529782c267b610285c0af25d1' 
  AND token = 'aBtDZZ0y4UqFmGXLO/R7D4y/97utux+utOF9oSmIaXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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