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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a47faacf3cf2119b746fd1d32fb5cc559b36afbdebb537f749b0b6daabf2c56' 
  AND token = 'IKmNRlooHd8Wek28ogpZbxqJ6mGDDVm/Nq1wpSfiRZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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