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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055e45b1de916e2803eb18c18242092f80e70e9014756a29bd5dab4f04df718e' 
  AND token = 'caveAC6tboVOonJ7ph4u7wFklQHS9oIHRx/Up01bUME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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