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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abaa4f913479e3706d832de8c90ff92cc1eff4419a07ef8a37355729c1753555' 
  AND token = '0Q1DjSX4t9VURSr8PCkH7K+nzUEb7BSzk78fKPOfziw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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