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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '419a6f009bd906674034009ee7c61483cfda38842554168bb5873a33f2214055' 
  AND token = 'CYbdqu4PKdhFrrJZGfr3U4aGN2NyhqerrvgegMnDcug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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