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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed70d0942cb2a6908415f85f341ea0f004b9b3e1562b9fc61f04a4d8e811f420' 
  AND token = 'MvUITX3CLLW4TEBrnlJ8wUY8PIwICSdOk9Q8mFmfx/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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