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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471ea42654861294aac4729ceaaa85ce9072b6126ae2f540792454d56248cff3' 
  AND token = 'G4CyXZi533Grj2BBuPez6dLXkw7H81y4akG4LSTgJZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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